Looping through the fields in store to find Max lenght of content for each column

Hi All,

I want to loop through the content of the each row for the fiven column with-in a store to find the max length of data in each column. I want to set the legth of the column based on this data. Lets say in my store I have 5 fields (column) & the store have 5 rows. First I want to loop through all the records to find out for each column which cell is holding the maximum data and then use that value to set the width with-in the grid.